The GAC (Gateway Athletic Conference) is comprised of seventeen schools who have joined together for their mutual benefit. The schools are members of the Missouri State High School Activities Association (MSHSAA). The conference is divided into three divisions based on enrollment. The Central and South divisions contain six schools each, while the North division contains five schools.

The schools choose all conference teams for many sports by a vote of the head coaches. In some sports, medallists are recognized as the all conference members. Lower level (sub-varsity) teams are divided into two-eight school divisions for tournaments.

Most sports have divisional representation on all conference teams. A few sports only have conference level teams, as there is not a sufficient number of teams to be divided by division.

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